Malicious PDF — malware analysis report

Static analysis result for SHA-256 811528f961019117…

MALICIOUS

PDF

84.7 KB Created: 2021-09-09 17:07:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 917492194190720796bcc6f0bef61e57 SHA-1: 982681c0154f54bc2aae6ca89ca1e9c177342e64 SHA-256: 811528f961019117cc61d8e88742594b1e3b15dee4798275da9ade9a29ba4cdb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified the document as a link farm, with multiple URLs pointing to potentially compromised or disposable hosting. The embedded URLs, such as http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/161307a798197e---xirekojoxibugefovujuxexel.pdf, suggest an attempt to direct users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://baovethanglongmb.com/upload/files/wutipabemoxajud.pdf In PDF document text
    • http://riverhouse.at/pcms/content/file/90790201751.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/16139c147e9d24---86775541071.pdfIn PDF document text
    • http://fitnessklub-impuls.pl/uploads/assets/file/15053134873.pdfIn PDF document text
    • http://usaoxin.com/userfiles/2021-9/file/geweli.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/161307a798197e---xirekojoxibugefovujuxexel.pdfIn PDF document text
    • http://thepducphat.com/upload/files/mijotoposebenijaja.pdfIn PDF document text
    • http://www.gonouvellezelande.com/files/zotozor.pdfIn PDF document text
    • https://nsck-cykelmotion.dk/userfiles/file/lozowotemupumodirafemeli.pdfIn PDF document text
    • http://debsecond.net/UserFiles/File/gokisikituti.pdfIn PDF document text
    • http://apexibd.com/uploads/fck_uploads/file/83327848806.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/18939514668.pdfIn PDF document text
    • https://museuminiaturesbesalu.com/files/pisimubojifujejiju.pdfIn PDF document text
    • http://gearonlaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zojitinaripogavox.pdfIn PDF document text
    • https://sindicav.com.br/ckeditor/ckfinder/userfiles/files/2240501.pdfIn PDF document text
    • http://euroear.eu/ckfinder/userfiles/files/27138776260.pdfIn PDF document text
    • http://pizzeriadevita.it/userfiles/files/52583412690.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613444312d532---90282202770.pdfIn PDF document text
    • https://chorland-dining.com/webroot/editor-uploads/files/zavujulixixusibegiwokegi.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/7ouovtbmdfkv6bc51dq7hdm9bo/zuwolovaseri.pdfIn PDF document text
    • http://xn--12cbg9dihj7egda2g6a7dceb1d2cp4nvgf4f.com/datas/files/sosuvukiwaremux.pdfIn PDF document text
    • https://eastmangroupllc.net/ckfinder/userfiles/files/jikomav.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=hollywood+story+cheat+codesPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e4eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4EB 18728 bytes
SHA-256: 98e490f2b0db017f093b0e480f5b63c6a65e6d50a7a269b04d954c23baa2005a
font_01_sfnt_off00011581.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11581 10460 bytes
SHA-256: 830d58c6fe3baa7f2b458433f9a72e2d7d89d85b24eac12b224c410c2f4eb3dd
font_02_sfnt_off00012d77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D77 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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